2 set bonus is a great bonus to the talents you already have (with pure LB spam you can clear the EM CD out in <1min)
4 set bonus is also great because more FT ticks means more Lava Surge procs, means more DPS.
The question is, do you lose much stats going for T10? If so, I'ld say it's probably very close to eachother.
If you can get 264 tokens then I'ld defo go for it (I am as well )